<template>
  <div class="swiper-container" ref="cur">
    <div class="swiper-wrapper">
      <div
        class="swiper-slide"
        v-for="(slide, index) in skuImageList"
        :key="slide.id"
      >
        <img :src="slide.imgUrl" :class="{active: currentIndex == index}" @click="changeCurrentIndex(index)" />
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>

  import Swiper from 'swiper'
  export default {
    name: "ImageList",
    data() {
      return {
        //鼠标点击图片，加个边框
        currentIndex: 0
      }
    },
    props: ['skuImageList'],
    watch: {
      //保证数据一定ok，但是不保证v-for一定遍历完，可以使用nextTick
      skuImageList(newValue,oldValue){
        this.$nextTick(() => {
          new Swiper (this.$refs.cur, { 
    // 如果需要前进后退按钮
    navigation: {
      nextEl: '.swiper-button-next',
      prevEl: '.swiper-button-prev',
    },
    //显示几个图片
    slidesPerView: 3,
    //每一次切换图个数
    slidesPerGroup: 1,
  }
)      
        })
      }
    },
    methods: {
      changeCurrentIndex(index) {
        this.currentIndex = index
        //通知兄弟组件当前索引值为几
        console.log('index=',index, 'this.currentIndex=',this.currentIndex);
        
        this.$bus.$emit('getIndex',this.currentIndex)

      }
    }
  }
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

     
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>